add name of faulty class to WritableName.getClass IOException upon 
ClassNotFoundException 
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                 Key: HADOOP-3180
                 URL: https://issues.apache.org/jira/browse/HADOOP-3180
             Project: Hadoop Core
          Issue Type: Improvement
            Reporter: Pete Wyckoff
            Priority: Trivial



WritableName.getClass raises an IOException when it cannot load the class. The 
message is "WritableName can't load class" without the name of the class.  
Although one can get this from getCause, easier to see it just from the message.

propose change it to:

      IOException newE = new IOException("WritableName can't load class: " + 
name);

I will attach a patch.


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